Constant astar_primitives::MAX_POV_SIZE

pub const MAX_POV_SIZE: u32 = _; // 10_485_760u32

Currently used MAX_POV_SIZE on Polkadot & Kusama is 10 MiB. At the moment of adding this constant, we’re using stable2412 which still has 5MiB limit.

To prevent excessive increase in gas used by ethereum transactions, we’ll define this temporary constant for the correct PoV limit. After the next uplift, this should be removed & replaced with value from polkadot-sdk.